Sucker rod



Sept. 7, 1926.

F. M. NEVINS SUCKER ROD Swan/whoa Original Filed March 6, 1-924MOM/10430.

Patented Sept. 7, -1 92 6.

UNITED STATES FRANK M. NEVINS, OF COALINGA, CLIFO'BNIA.

suoxnn. non.

Application filed March 6, 1924, Serial No. 697,816. Renewed Mia rent),1926.

My invention relates to improvements in sucker rods for deep wells, andhas reference more particularly to rods of the tubular type, adapted tocontain air whereby'they' are rendered buoyant and consequently greatlyfacilitate the operation of the pump with which connected. I am awarethat a tubular sucker rod has been devised to contain compressed air tocounteract the ex- 1 ternal pressure of the liquid in which the rodoperates and to impart buoyancy to said rod, but whereas it is necessaryto compress the air in the tubular rod to which I refer, by means of anair compressor or the like,

it is the object of my invention to provide a tubular rod which is openat its lower end to permit the liquid from the well to rise to someextent in the rod, so that such liquid will compress the normalatmospheric air in said rod and will consequently produce an internalpressure in the rod, equal to the external pressure.

With the foregoing in view, the invention resides-in the novel subjectmatter herein- 2 after described and claimed,the description beingsupplemented by the accompanying drawing.

Figures 1 and 2 are, side elevationspartly in section, showing a sectionof a sucker rod so constructed in accordance with my invention.

- Figure 3 is an enlarged vertical sectional view as indicated by line3-3 of Fig. 2-.

Figure 4 is a sectional view at right angles to Fig. 3 as indicated byline 44 thereof. Figures 5 and 6 are horizontal sections is indicated bylines 5-5 and 6-6 of 1g; 3. y In the drawing above briefly. described,40 the numeral -1 designates'a section of a sucker rod constructed inaccordance with my invention, said section being in the form of a metaltube of any desired dimensionthe upper and lower ends 2 and 3 of saitube being preferably contracted and integrally joined to squared necks4 for engagement with a wrench, one of these necks being provided with asocket 5 while the other is equipped with a threaded nipple 6, sothatthe tubular rod section may be coupled to other sections, whether ofordinary construction or of tubular form..

I have shown all parts of the tube 1, ex-

cept its lower extremity, of air-tight construction, but haveillustrated a pair of openings 7 in said lower extremity so that liquidfrom the well may enter the tube and compress the atmospheric air in thelatter, thereby imparting buoyancy to the rod and counteracting theinward pressure of the liquid upon the tube. If desired, only oneopening might be employed, or any desired number of such openings may beused, as occasion may require. Each opening is preferably covered with ascreen 8 to prevent sand and the like from entering the rod.

To protect the rod against contact with a crooked well casing, Ipreferably provide collars 9 which are preferably shrunk around the rodat suitable points, said collars being provided with liquid passagesfrom top to bottom, which are preferably in the form of transversegrooves 10, in the peripheries of said collars.

By providing the constructionjshown and described, or a substantialequivalent thereof, a very desirable and eflicientrod is produced and asexcellent results may be obtained from the details disclosed, they arepreferably followed, but within the scope of the invention as claimed,numerous minor changes may be made.

I claimz' 1. A sucker rod comprising a tube closed at its upper end butopen at its lower end to admit liquid from the well inwhich the rod isused whereby such liquid may compress air in the tu e to counteract theinward pressure of the liquid and impart buoyancy to the rod.

2. A sucker rod comprising a tube closed at its upper'end but having ascreened 0 ening in its lower end to admit liquid rom the well in whichthe rod is used,'whereby such liquid may compress air in the tube tocounteract the inward pressure of the liquid and impart buoyancy to therod.

In testimony whereof I have hereunto set my hand.

FRANK M. 'NEVINS.

